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Assessment of the power conversion of wave energy converters based on experimental tests

机译：基于实验测试的波能转换器功率转换评估

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摘要

Power estimation is the most important task in the performance assessment of wave energy converters (WEC). Depending on the type of WEC, power take-off (PTO) system, and available instrumentation, different approaches are usually applied to assess power from experimental tests. Since neither for tests execution nor for the analyses exist standard methodologies, the estimated power can significantly differ among the approaches, thus, introducing inaccuracies in the assessment of the WEC's performance. This study analyzed an extensive set of experimental results of a WEC and applied different power estimation approaches to compare and validate the obtained results. The strengths and weaknesses of those methodologies were analyzed and discussed. The major outcomes were: (a) PTO damping characterization based on bench tests can lead to unrealistic values of the WEC's absorbed power; (b) the hybrid (experimental plus numerical) approach provide more reliable results than the traditional ones; (c) the kinetic energy harvester approach underestimates power but can be useful for preliminary qualitative performance assessments; (d) the new proposed gross efficiency index allows the definition of upper boundaries for wave power conversion as well as the identification of the wave conditions for which WEC performance can be improved.
机译：功率估算是波能转换器（WEC）性能评估中最重要的任务。根据WEC的类型，取力器（PTO）系统和可用的仪器，通常采用不同的方法来评估实验测试的功率。由于测试执行和分析均不存在标准方法，因此评估方法之间的估计功效可能存在显着差异，从而在评估WEC的性能时引入了不准确之处。这项研究分析了WEC的大量实验结果，并应用了不同的功率估算方法来比较和验证所获得的结果。分析和讨论了这些方法的优缺点。主要结果是：（a）基于基准测试的PTO阻尼特性可能导致WEC的吸收功率值不切实际； （b）混合（实验加数值）方法比传统方法提供更可靠的结果； （c）动能收集器方法低估了功率，但可用于初步定性性能评估； （d）新提议的总效率指数允许定义波浪功率转换的上限，并确定可以改善WEC性能的波浪条件。

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